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Renesas ISL78234AARZ-T
- Part No.:
- ISL78234AARZ-T
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78234AARZ-T.pdf
- Description:
- IC REG BUCK ADJ 4A 16WFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,503
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Product details
Overview
ISL78234AARZ-T from Renesas Electronics is a 4A monolithic synchronous buck regulator optimized for automotive infotainment and ADAS power rails, delivering up to 95% efficiency at 2MHz switching, featuring integrated 35mΩ P-channel and 11mΩ N-channel MOSFETs, 2.7V–5.5V input range, and AEC-Q100 qualification for -40°C to +125°C operation.
For engineers reviewing the ISL78234AARZ-T datasheet, ISL78234AARZ-T pinout, ISL78234AARZ-T application, or ISL78234AARZ-T equivalent, key selection criteria include its 4A continuous output capability, adjustable 500kHz–4MHz frequency, internal/external compensation flexibility, soft-stop output discharge, and 1ms Power-Good assertion timing.
Technical Context
The ISL78234AARZ-T employs current-mode PWM control with slope compensation (440mV/Ts) and pulse-by-pulse current limiting, enabling fast transient response and stable loop behavior across wide load and line variations. Its dual-MOSFET architecture supports 100% duty-cycle operation for <200mV dropout at 4A.
It integrates fault protection including hiccup-mode overcurrent, thermal shutdown (150°C trip), overvoltage (0.80V PG threshold), undervoltage lockout (2.7V rising), and negative current limiting (-2.8A typical), all operating within the full automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-power SoC/FPGA core rails without external current sharing. |
| Input Voltage Range | 2.7V to 5.5V - compatible with 3.3V/5V systems and Li-ion battery inputs (3.0–4.2V). |
| Switching Frequency | Adjustable 500kHz–4MHz (default 2MHz) - enables compact magnetics and EMI optimization. |
| Efficiency | Up to 95% - minimizes thermal load in space-constrained automotive modules. |
| Reference Accuracy | ±1% over temp/load/line - ensures tight output regulation for sensitive processor cores. |
| Power-Good Delay | 1ms after regulation - provides deterministic system sequencing for microcontrollers and FPGAs. |
| Quiescent Current | 45µA (PFM, no load) - extends battery runtime in always-on automotive subsystems. |
| Thermal Rating | AEC-Q100 Grade 1 (−40°C to +125°C junction) - qualified for under-hood and infotainment applications. |
Pinout & Package
ISL78234AARZ-T is housed in a 5mm × 5mm, 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad, optimized for automotive thermal reliability and solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input supply rail | Accepts 2.7–5.5V; requires ≥2×22µF ceramic decoupling directly to PGND for stability. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor; discharged via 100Ω resistor during shutdown to prevent reverse current. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; sets VOUT = 0.6V × (1 + R2/R3); monitors OVP/UVP. |
| COMP (Pin 8) | Error amplifier output | Supports internal compensation (tie to VDD) or external network for loop tuning flexibility. |
| EN (Pin 5) | Enable control | Active-high logic; pulls output capacitor to SGND via internal soft-stop switch when low. |
| PG (Pin 3) | Open-drain power-good | Asserts after 1ms delay when VOUT reaches ±1% of target; requires external pull-up to VIN. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW from 500kHz–4MHz; tied to VIN for default 2MHz operation. |
| SS (Pin 7) | Soft-start control | 1ms internal ramp when shorted to SGND; capacitor extension allows programmable startup time. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 35mΩ P-ch HS + 11mΩ N-ch LS - eliminates external switches and reduces BOM to ≤3 external components. |
| 100% Duty-Cycle Operation | Enables <200mV dropout at 4A - critical for low-VIN scenarios like cold-crank battery conditions. |
| Soft-Stop Output Discharge | Internal switch actively discharges VOUT on disable - prevents floating rail issues in multi-rail systems. |
| Mode Flexibility | PWM (forced continuous) or PFM (discontinuous) - selectable via SYNC pin for noise vs. efficiency trade-off. |
| Robust Protection Suite | Hiccup OCP, thermal shutdown (150°C), OVP/UVP, and negative current limit - reduces need for external supervision. |
| Automotive Qualification | AEC-Q100 Grade 1, MSL3, and 5kV HBM ESD - validated for production automotive electronics. |
Applications
| Automotive Infotainment Power | FPGA Core Supply |
|---|---|
Use Scenario: Powering display processors and audio DSPs in head units with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V POL regulator delivering 4A with 2MHz switching to minimize filter size. Use Value: AEC-Q100 qualification and 1ms PG timing enable safe boot sequencing in ISO 26262-compliant systems. |
Use Scenario: Supplying configurable logic and I/O banks in automotive FPGA-based ADAS controllers. IC Role / Device Role / Timing Role: High-current, low-noise buck converter supporting dynamic voltage scaling and rapid load transients. Use Value: Current-mode control and 4A capability maintain regulation during 3A step-load changes with <50mV droop. |
| Li-ion Powered Telematics | Video SoC Power |
Use Scenario: Power management for cellular/V2X modules operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Efficient step-down regulator converting battery voltage to 1.1V/1.8V SoC rails. Use Value: 45µA quiescent current in PFM mode extends standby time; 100% duty cycle sustains output during battery sag. |
Use Scenario: Delivering clean, regulated power to image signal processors and video codecs in surround-view systems. IC Role / Device Role / Timing Role: Low-noise, high-PG-accuracy regulator ensuring stable clock domain operation. Use Value: ±1% reference accuracy and 1ms PG delay guarantee precise reset timing for video pipeline initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4433AGL-A-Z | 3.5A max output, 2.5–6V input, fixed 2.2MHz fSW, no soft-stop discharge | Lacks active output discharge and AEC-Q100 qualification; suitable for non-automotive industrial use | Choose when cost sensitivity outweighs automotive compliance and soft-stop requirement |
| TPS544B20RTWR | 4A, 4.5–18V input, 300kHz–2MHz fSW, PMBus interface, larger 4×4 QFN | Higher VIN range and digital control; not pin-compatible and lacks wettable flank package | Prefer when system-level telemetry, remote configuration, or >5.5V input is required |
Compared with MPQ4433AGL-A-Z and TPS544B20RTWR, the ISL78234AARZ-T uniquely combines AEC-Q100 qualification, soft-stop discharge, wettable flank packaging for automated optical inspection, and 2.7–5.5V input range optimized for automotive battery domains.
Availability
ISL78234AARZ-T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS controller, and telematics module designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for ISL78234AARZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.
The ISL78234AARZ-T belongs to Renesas' ISL7823x automotive-grade buck regulator family, designed specifically for high-reliability, high-efficiency point-of-load conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum continuous output current of the ISL78234AARZ-T?
The ISL78234AARZ-T delivers 4A of continuous output current across the full operating temperature range of −40°C to +125°C, as verified in the FN8359 datasheet under recommended conditions (VIN = 3.6V, TA = −40°C to +125°C). This rating applies to both TQFN and WFQFN package variants, including the ISL78234AARZ-T.
Does the ISL78234AARZ-T support external frequency synchronization?
Yes, the ISL78234AARZ-T supports external synchronization up to 4MHz via the SYNC pin, which accepts a positive-edge-triggered clock signal. When used in sync mode, the device maintains current-mode control and retains all protection features, including overcurrent and thermal shutdown. This capability is explicitly confirmed in the "Frequency Adjust" and "SYNC" sections of the FN8359 datasheet.
How does the soft-stop function operate in the ISL78234AARZ-T?
When the EN pin is driven low, the ISL78234AARZ-T activates an internal soft-stop switch that actively discharges the output capacitor through a controlled path to SGND. This prevents the output rail from floating or back-driving other supplies, a critical requirement in multi-rail automotive systems. The behavior is documented in the "Discharge Mode (Soft-Stop)" section of FN8359 Rev.11.01.
Is the ISL78234AARZ-T pin-compatible with the ISL78233 series?
No - while the ISL78234AARZ-T shares identical pinout and footprint with the ISL78233AARZ-T (both use the 5×5mm WFQFN package), they differ in maximum output current (4A vs. 3A) and current-limit thresholds. The shared pinout simplifies board-level upgrades but requires validation of inductor, capacitor, and thermal design for the higher 4A load.
What package type is used by the ISL78234AARZ-T?
The ISL78234AARZ-T uses a 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) package measuring 5mm × 5mm, with an exposed thermal pad. This RoHS-compliant, NiPdAu-Ag plated (e4 finish) package meets AEC-Q100 requirements and supports automated optical inspection (AOI) due to its wettable flank geometry - confirmed in the Ordering Information table on page 5 of FN8359 Rev.11.01.
ISL78234AARZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 420kHz ~ 4.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WFQFN (5x5)
ISL78234AARZ-T FAQ
1.How can I place an order for ISL78234AARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78234AARZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL78234AARZ-T reliable?
The price and inventory of ISL78234AARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78234AARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78234AARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78234AARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78234AARZ-T?
ISL78234AARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78234AARZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL78234AARZ-T?
For technical support, including ISL78234AARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78234AARZ-T requirements.
6.How does Aetrix verify that ISL78234AARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78234AARZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL78234AARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78234AARZ-T?
All ISL78234AARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78234AARZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL78234AARZ-T part is unused and in its original packaging.
Return procedure for ISL78234AARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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